On Fri, Sep 23, 2016 at 9:30 AM, Ted Mielczarek <t...@mielczarek.org> wrote:

> On Fri, Sep 23, 2016, at 10:20 AM, Ehsan Akhgari wrote:
> > On 2016-09-23 8:49 AM, Gijs Kruitbosch wrote:
> > > Then this enables me to answer Ehsan's question. These are the builds
> > > I've recently tried using (e.g. when debugging intermittents in VMs
> > > because then I don't need to set up too much of a build env) and
> they're
> > > still very slow.
> >
> > Unfortunately I don't think we can do debug builds that are faster than
> > that.  It's possible that the debugging checks that we perform in the
> > cases you're trying to use the browser in are just prohibitively too
> > expensive.  :(
>
> If someone had time, it might be interesting to profile something that
> feels slow in an --enable-debug --enable-optimize build and see if
> anything stands out. These builds will always be a little slower than
> the builds we ship (because they're not PGOed), but it would be nice if
> they were at least usable. Making them faster would also make our debug
> test runs in automation faster, which is a nice win! (We spend *a lot*
> of CPU time running debug tests in automation.)
>

Nathan looked at this a few years ago:
https://bugzilla.mozilla.org/show_bug.cgi?id=972135

There's some low-hanging fruit for anyone with static analysis savvy.


>
> -Ted
>
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